26系统下，隐藏导航栏的横屏页面退回到有导航栏的竖屏页面时，UI布局闪动

[a714857512]

Bug 表现
在iOS 26系统下，从一个隐藏导航栏的横屏页面返回到一个有导航栏的竖屏页面，横竖屏约束的切换动画会闪动（动画执行到一半的时候，直接变成了竖屏的约束，26之前的系统不存在这个情况）。

截图

如何重现
如问题描述

预期的表现
不闪动，下面是AI的解决方法

// MARK: - iOS 26 导航转场布局兼容
private extension EHBaseViewControllerSwift {

override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
applyIOS26NavigationTransitionLayoutWorkaroundIfNeeded(animated: animated)
}

func applyIOS26NavigationTransitionLayoutWorkaroundIfNeeded(animated: Bool) {
    guard animated,
          #available(iOS 26.0, *),
          let coordinator = transitionCoordinator ?? navigationController?.transitionCoordinator,
          let fromViewController = coordinator.viewController(forKey: UITransitionContextViewControllerKey.from),
          let toViewController = coordinator.viewController(forKey: UITransitionContextViewControllerKey.to),
          toViewController === self,
          fromViewController.supportedInterfaceOrientations != toViewController.supportedInterfaceOrientations else {
        return
    }

    guard let targetView = view else { return }

    let updateLayoutWithoutAnimation = {
        UIView.performWithoutAnimation {
            // iOS 26 + QMUI 导航栏显隐转场叠加方向变化时，目标页布局可能被系统插入到转场动画中。
            // 在目标页 viewWillAppear 阶段跟随 coordinator 做无动画布局，避免横竖屏转场中途闪跳。
            targetView.setNeedsLayout()
            targetView.superview?.setNeedsLayout()
            targetView.superview?.layoutIfNeeded()
            targetView.layoutIfNeeded()
        }
    }

    let didRegister = coordinator.animate(alongsideTransition: { _ in
        updateLayoutWithoutAnimation()
    }, completion: nil)
    if didRegister == false {
        updateLayoutWithoutAnimation()
    }
}

}

其他信息

• 设备: [例如模拟器、iPhone、iPad]
• iOS 版本: [iOS 26.x]
• Xcode 版本: [Xcode 26.x]
• QMUI 版本: [https://github.com/CloudlessMoon/QMUI_iOS.git]